/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.http.message;

import java.util.Iterator;

import org.apache.http.Header;
import org.apache.http.HeaderIterator;
import org.apache.http.HttpMessage;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpParams;

/**
 * Basic implementation of {@link HttpMessage}.
 * 
 * @since 4.0
 */
public abstract class AbstractHttpMessage implements HttpMessage {

	protected HeaderGroup headergroup;

	protected HttpParams params;

	protected AbstractHttpMessage(final HttpParams params) {
		super();
		this.headergroup = new HeaderGroup();
		this.params = params;
	}

	protected AbstractHttpMessage() {
		this(null);
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public boolean containsHeader(String name) {
		return this.headergroup.containsHeader(name);
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public Header[] getHeaders(final String name) {
		return this.headergroup.getHeaders(name);
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public Header getFirstHeader(final String name) {
		return this.headergroup.getFirstHeader(name);
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public Header getLastHeader(final String name) {
		return this.headergroup.getLastHeader(name);
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public Header[] getAllHeaders() {
		return this.headergroup.getAllHeaders();
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public void addHeader(final Header header) {
		this.headergroup.addHeader(header);
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public void addHeader(final String name, final String value) {
		if (name == null) {
			throw new IllegalArgumentException("Header name may not be null");
		}
		this.headergroup.addHeader(new BasicHeader(name, value));
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public void setHeader(final Header header) {
		this.headergroup.updateHeader(header);
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public void setHeader(final String name, final String value) {
		if (name == null) {
			throw new IllegalArgumentException("Header name may not be null");
		}
		this.headergroup.updateHeader(new BasicHeader(name, value));
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public void setHeaders(final Header[] headers) {
		this.headergroup.setHeaders(headers);
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public void removeHeader(final Header header) {
		this.headergroup.removeHeader(header);
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public void removeHeaders(final String name) {
		if (name == null) {
			return;
		}
		for (@SuppressWarnings("rawtypes")
		Iterator i = this.headergroup.iterator(); i.hasNext();) {
			Header header = (Header) i.next();
			if (name.equalsIgnoreCase(header.getName())) {
				i.remove();
			}
		}
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public HeaderIterator headerIterator() {
		return this.headergroup.iterator();
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public HeaderIterator headerIterator(String name) {
		return this.headergroup.iterator(name);
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public HttpParams getParams() {
		if (this.params == null) {
			this.params = new BasicHttpParams();
		}
		return this.params;
	}

	// non-javadoc, see interface HttpMessage
	@Override
	public void setParams(final HttpParams params) {
		if (params == null) {
			throw new IllegalArgumentException(
					"HTTP parameters may not be null");
		}
		this.params = params;
	}
}
